参数资料
| 型号： | SC900841JVKR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 69/192页 |
| 文件大小： | 0K |
| 描述： | IC POWER MGT 338-MAPBGA |
| 标准包装： | 2,000 |
| 应用： | PC，PDA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 338-TFBGA |
| 供应商设备封装： | 338-MAPBGA |
| 包装： | 带卷 (TR) |
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FUNCTIONAL DEVICE OPERATION
POWER SUPPLIES
Note that all of the DC/DC regulators specify an extended
input voltage range beyond the 3.0 to 4.4 V applications
range. Under this extended range, functionality is
maintained, but parametric performance might be
compromised.
VCC
This is a VID controlled single-phase 1.0 MHz 2-switch
synchronous Buck PWM voltage mode control DC/DC
regulator, designed to power high performance CPUs. VCC
uses external MOSFETs, P-Ch high side and N-Ch low side.
VCC includes support for VID active voltage positioning
requirements. A 7-bit DAC reads the VID input signals and
sets the output voltage level. The output voltage has a range
of 0.3 to 1.2 V. The programming step size is 12.5 mV.
Values will be read in real time and will be stored in internal
registers not accessible to the system host. Reference
The same VID input signals are shared between VCC and
VNN, where a latch signal for each regulator decides which
regulator takes control of the VID input signals.
The DAC value represents the output voltage value. The
output voltage node is connected directly to the inverting
input of the error amplifier that uses the DAC output as its
reference, unity gain configuration. Using this configuration
with internal compensation eliminates the need for the
feedback and compensation network, which saves board
space and cost. The DAC/output voltage slew rate is
internally set 25 mV/μs to minimize transient currents and
audible noise.
The switcher can operate in different modes depending on
the load conditions. These modes can be set through the SPI
and include a PFM mode, an Automatic Pulse Skipping
mode, and a PWM mode. The above selection is optimized
to maximum battery life based on load conditions.
VCC will be discharged every time the regulator is shutting
down.
The output current will be sensed using an intelligent
implementation of the DCR sensing method using internal
sensing circuitry, which eliminates the need for an external
RC filter network in parallel with the output inductor and its
winding resistance.
DCR sensing theory is that if the impedance of the two
filters are matching by insuring that R*C = L/R W , then the
voltage across the capacitor is equal to the value of the
voltage across the winding resistance R W , V CAP = I LOAD *R W .
Based on this, the voltage across the capacitor is measured,
and with a known R W value, the load current can be
extracted. The measured current value will be digitized by the
ADC and stored in a register for the processor to access. The
method used on the 900841 measures the voltage across R W
in a similar fashion, while using internal sensing circuitry.
The sensed output current value will also be used for over-
current protection. If an over-current condition is detected,
the regulator will limit the current through cycle by cycle
operation, and alert the system through the VCCFAULT
signal, which will in turn assert the VRFAULT Interrupt signal.
V PWR
PVINCC
C INCC
HSCCGT
V CC
L CC
M HSCC
Driver
CTLVCC
AOACCTLVCC
C OCC
M LSCC
LSCCGT
Controller
PGNDCC
SWFBCC
CSPCC
Current Sense
Amp
I CC
VCCFAULT
SPI
Interface
Internal
Compensation
Z2
VOUTFBCC
Z1
EA
V REF
GNDREFVCC
DAC
VIDEN0
VIDEN1
Figure 23. VCC Detailed Internal Block Diagram
Main Features
? Uses the V PWR rail as its power supply
? It is used to provide power to the CPU Core.
? Single-Phase Solution with Integrated Drivers and
external MOSFETs
? VID Controlled for dynamic voltage scaling requirements
of high performance processors
? 1.0 MHz switching frequency
? High efficiency operating modes depending on load
conditions
? Output can be discharged through the low side switch.
900841
Analog Integrated Circuit Device Data
Freescale Semiconductor
69
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